⚖️ BMI Calculator
Body Mass Index · Healthy Weight Range · Weight Category
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BMI Result
Your BMI
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UnderNormalOverObese IObese II+
Healthy weight range
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Difference from healthy
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WHO BMI Categories
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese Class I | 30.0 – 34.9 |
| Obese Class II | 35.0 – 39.9 |
| Obese Class III | ≥ 40.0 |
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Frequently Asked Questions
According to the WHO, a BMI between 18.5 and 24.9 is considered normal/healthy weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
BMI is a useful screening tool but does not directly measure body fat. Athletes with high muscle mass may have a high BMI without being overweight, while older adults may have a normal BMI but higher body fat. Always consult a healthcare provider for a full assessment.
BMI = weight (kg) ÷ height (m)². In imperial units: BMI = (weight in lbs × 703) ÷ (height in inches)². The result places you in a weight category based on WHO standards.